Study On Potential Of Waterflooding Development And Adjustment Of Water Injection Parameters In The North East District

L oilfield has entered a period of extremely high water content,and the comprehensive water content is above 95%.The problem of ineffective circulation is increasingly serious,and it is increasingly difficult to control the decreasing yield and the rise of water content.Under the current development method,the development effect is poor.Therefore,when carrying out the structural adjustment of injection and mining,it is necessary to combine the invalid cycle problem in the block.At the same time,fully understand the geological characteristics of the oil field,residual oil potential,development status and problems in the development process,and adjust the water drive development.According to the actual production situation of North East Zone 1 of L Oilfield,we analyze the residual distribution characteristics of the research area,evaluate the residual oil potential,evaluate the existing invalid circulation channels and divide the levels,and propose adjustment countermeasures for the invalid circulation channels of different levels.Combined with the invalid cycle,the water drive injection parameters of the study area were adjusted and the effect of optimized parameters were evaluated.The residual oil distribution characteristics are realized that the residual oil distribution in the plane is scattered in the middle of the block,and the residual reserves of the longitudinal deposition unit,the residual oil distribution types of the imperfect well network,the residual oil and the residual oil potential distribution map.The existing invalid loop channels were evaluated by tracer simulation and injection parameter analysis and used fuzzy comprehensive criterion to determine the invalid loop criterion index into five intervals,namely R <0.2,0.2≤ R <0.3,0.3 ≤ R<0.4,0.4≤ R <0.5,R ≥0.5.Combined with the ideal model and the actual model,the invalid cycle of different intervals is adjusted,and the invalid cycle governance countermeasures to determine different intervals are considered by economic factors.At the same time,the invalid cycle discrimination index R <0.2 is divided as four levels of invalid cycle,0.2≤ R <0.3 is the tertiary invalid cycle,0.3≤ R <0.4 is the secondary invalid cycle,and R ≥0.4 is the primary invalid cycle.According to the current characteristics of the research area,the influencing factors of stratified water injection were studied by numerical simulation,determine the segment division method as the seepage resistance coefficient of variation method,and determine the reasonable injection ratio and oil production speed of 1.12 and 0.39% respectively,respectively,and evaluate the optimized injection ratio and oil production speed for the effect.